Whey protein isolate is a highly processed whey protein. By weight, whey protein isolate is 90% protein. This makes it a purer protein than whey protein concentrate. It is also absorbed faster into your muscles, which is beneficial if you are taking whey protein post workout, as this is when your muscles require protein the most.

Whey protein isolate, despite losing some of its immune boosting properties through its multiple processing, is still ripe with Glutathione levels, which are still important for the immune system. Whey protein isolate also has lower lactose levels than concentrate. Because of its higher quality however, whey protein isolate can be more expensive.